/*******************************************************************************
 * Copyright (c) 2000, 2008 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.wst.jsdt.internal.ui.fix;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.wst.jsdt.core.IJavaScriptUnit;
import org.eclipse.wst.jsdt.core.dom.JavaScriptUnit;
import org.eclipse.wst.jsdt.internal.corext.fix.CleanUpConstants;
import org.eclipse.wst.jsdt.internal.corext.fix.ConvertLoopFix;
import org.eclipse.wst.jsdt.internal.corext.fix.IFix;
import org.eclipse.wst.jsdt.ui.text.java.IProblemLocation;

public class ConvertLoopCleanUp extends AbstractCleanUp {
	
	public ConvertLoopCleanUp(Map options) {
		super(options);
	}
	
	public ConvertLoopCleanUp() {
		super();
	}
	
	/**
	 * {@inheritDoc}
	 */
	public boolean requireAST(IJavaScriptUnit unit) throws CoreException {
		return isEnabled(CleanUpConstants.CONTROL_STATMENTS_CONVERT_FOR_LOOP_TO_ENHANCED);
	}
	
	/**
	 * {@inheritDoc}
	 */
	public IFix createFix(JavaScriptUnit compilationUnit) throws CoreException {
		if (compilationUnit == null) {
			return null;
		}
		
		boolean convertForLoops= isEnabled(CleanUpConstants.CONTROL_STATMENTS_CONVERT_FOR_LOOP_TO_ENHANCED);
		
		return ConvertLoopFix.createCleanUp(compilationUnit,
				convertForLoops, convertForLoops,
				isEnabled(CleanUpConstants.VARIABLE_DECLARATIONS_USE_FINAL) && isEnabled(CleanUpConstants.VARIABLE_DECLARATIONS_USE_FINAL_LOCAL_VARIABLES));
	}
	
	/**
	 * {@inheritDoc}
	 */
	public IFix createFix(JavaScriptUnit compilationUnit, IProblemLocation[] problems) throws CoreException {
		//No warnings generated by the compiler
		return null;
	}
	
	/**
	 * {@inheritDoc}
	 */
	public Map getRequiredOptions() {
		return null;
	}
	
	/**
	 * {@inheritDoc}
	 */
	public String[] getDescriptions() {
		List result= new ArrayList();
		
		if (isEnabled(CleanUpConstants.CONTROL_STATMENTS_CONVERT_FOR_LOOP_TO_ENHANCED)) {
			result.add(MultiFixMessages.Java50CleanUp_ConvertToEnhancedForLoop_description);
		}
		
		return (String[])result.toArray(new String[result.size()]);
	}
	
	public String getPreview() {
		StringBuffer buf= new StringBuffer();
		
		if (isEnabled(CleanUpConstants.CONTROL_STATMENTS_CONVERT_FOR_LOOP_TO_ENHANCED)) {
			buf.append("for (var element in ids) {\n"); //$NON-NLS-1$
			buf.append("    var value= element / 2; \n"); //$NON-NLS-1$
			buf.append("    alert(value);\n"); //$NON-NLS-1$
			buf.append("}\n"); //$NON-NLS-1$
		} else {
			buf.append("for (var i = 0; i < ids.length; i++) {\n"); //$NON-NLS-1$
			buf.append("    var value= ids[i] / 2; \n"); //$NON-NLS-1$
			buf.append("    alert(value);\n"); //$NON-NLS-1$
			buf.append("}\n"); //$NON-NLS-1$
		}
		
		return buf.toString();
	}
	
	/**
	 * {@inheritDoc}
	 */
	public boolean canFix(JavaScriptUnit compilationUnit, IProblemLocation problem) throws CoreException {
		return false;
	}
	
	/**
	 * {@inheritDoc}
	 */
	public int maximalNumberOfFixes(JavaScriptUnit compilationUnit) {
		return -1;
	}
}
